Types of Forces

Which set of charged particles is likely to experience a greater force? Assume distance is the only difference between the sets.

• Set A

• There is not enough information.

• Set B

• They are both the same.

A roller coaster uses electromagnets on the track as a starting launcher. The electromagnets are switched on in sequence and propel the roller coaster forward. What else is likely to be a feature of the roller coaster?

• The electromagnets take time to work.

• The roller coaster cannot stop because of the attractive forces.

• A bumpy ride due to the electric field.

• The current can be reversed to allow for a reverse ride.

Which is a determining factor for the direction a motor spins in an electric motor?

• Direction of the magnetic field

• Strength of the magnet

• Amount of current in a wire

• Direction of the motor

What happens when a wire that carries electric current is placed in a magnetic field?

• The electric current always decreases.

• The wire experiences acceleration.

• The wire experiences a force.

• The electric current in the wire stops.

What effect will increasing the number of magnets in an electric motor have on the speed of the motor?

• The speed of the motor is not dependent on the magnets.

• The motor will run faster.

• The motor will run slower.

• The speed of the motor is unchanged.

Which would increase the strength of an electromagnet?

• Increasing the distance between the coils.

• Using a weaker magnet.

• Increasing the number of coils in the wire.

• Decreasing the electric current.

What can affect the strength of an electromagnet?

• The magnetic field of an electromagnet.

• The potential energy of the electromagnet.

• The direction of the electric current flowing through the electromagnet.

• The amount of electric current flowing through the electromagnet.

If you have two particles at a certain close distance, what happens if the charge on one particle is increased?

• The force between the particles will stay the same.

• Charged particles are not affected by the charges of other particles.

• The force between the particles will increase.

• The force between the particles will decrease.

What direction must a wire carry a current relative to a magnetic field to experience forces?

• The direction does not matter.

• In line with the magnetic field

• Perpendicular to the magnetic field

• Parallel to the magnetic field

What happens to two charged objects as the distance between them increases?

• The forces and fields decrease

• The forces and fields increase

• The forces and fields are not dependent on distance.

• The forces and fields are unchanged